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To understand how a laserjet printer prints is to understand the basics of electrical charges like static electricity. This is how a laserjet printer makes a powder toner adhere to a piece of paper. The first thing is to understand the opposites attract. This is how magnets work, positive charges are attracted to and stick to negative charges.
To explain this in basic terms:

1. The printer puts a negative charge on the paper.
3. The printer’s laser spreads a negative electrostatic image onto a positively charged drum (reversing the polarity only where the image is)
2. The drum roller with the negatively charged image rolls over the positively charged toner, picking the toner on the image only (opposites attract).
3. The paper is then feed to the fuser unit where hot rollers heat up the paper and press the toner onto the paper. Since the toner is partly made up of plastic, the plastic melts and gets pressed to the paper making it adhere permanently.
4. The finished product is rolled out.